Inconsistency with responses to FAQs in knowledge base

When I add a new FAQ to my knowledge base and then I test using the exact same question as held in the knowledge base, I can’t understand why I get a completely different response when using the knowledge preview button compared to the response I get in the agent designer.

When I’m in the designer and look closely at the intent that the question triggers, I can see no resemblance to the question or subject matter in any of the utterances, yet the question triggers seems to keep triggering the intent instead of pulling the answer from the KB.

I realise that I’m not being specific about the actual question and the responses I’m getting, but this has happened several times already with other FAQs I have applied.

Is this a common problem, or is there something I’m doing wrong?

Thanks!